#define _CRT_SECURE_NO_WARNINGS 1

#include<iostream>
//using namespace std;
int sum(int a, int b)
{
	return a + b;
}
int sum(int a, int b, int c)
{
	return a + b + c;
}
float sum(float a, float b)
{
	return a + b;
}
int main()
{
	float a1 = 3.1, a2 = 3.2;
	int a = 3, b = 4, c = 5;
	std::cout << sum(a, b);
	std::cout << "hello world";
	std::cout << sum(a, b, c);
	std::cout << sum(a1, a2);
	return 0;
}